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2. Atomic clock - Wikipedia

   en.wikipedia.org/wiki/Atomic_clock

   The development of atomic clocks has led to many scientific and technological advances such as precise global and regional navigation satellite systems, and applications in the Internet, which depend critically on frequency and time standards. Atomic clocks are installed at sites of time signal radio transmitters. [113]

3. List of atomic clocks - Wikipedia

   en.wikipedia.org/wiki/List_of_atomic_clocks

   18 cesium atomic clocks and 4 hydrogen maser clocks Cs, H ... New Delhi, India; DOST-PAGASA Juan Time [27] Department of Science and Technology; Taguig, ...

4. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   It is also possible for quartz clocks and watches to have their quartz crystal oscillate at a higher frequency than 32 768 (= 2 15) Hz (high frequency quartz movements [4]) and/or generate digital pulses more than once per second, to drive a stepping motor powered second hand at a higher power of 2 than once every second, [5] but the electric ...

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7. Alarm clock - Wikipedia

   en.wikipedia.org/wiki/Alarm_clock

   A mid-1940s alarm clock radio with AM radio stations only A typical 1980s clock radio featuring a digital clock/alarm and an analogue FM/MW/LW receiver. A clock radio is an alarm clock and radio receiver integrated in one device. [18] The clock may turn on the radio at a designated time to wake the user, and usually includes a buzzer alarm.